I've a pre-war Omega D-II enlarger and am stumped as to the best way to align the bellows/head/lamp assembly to the enlarger rail. You can adjust this assembly with four 'bars' that each have two plastic bushing. The bars are concentric, you can adjust each one for friction and this tilts the entire assembly 'backwards' and 'forwards'. Too tight and you can't really move the head up and down. Too loose and it's 'sloppy'. Either way I can't get it right. Any old-hands know of a trick? There must be a very simple and easy way of doing this, i'm sure there was some assembly at the Omega factory using nothing more that a tall wooden box and some string. Argh! Also, anyone know of a suitable replacement for those plastic well bushings? I've seen similar substitutes at Lowe's and online but they aren't exact. If I had a lathe. Ah well. I'm using a laser level and mirror for alignment and with the head extended at different heights I'm seeing the 'dot' move unproportionally. These plastic bushings are worn and peeling. I'm sure this is the culprit. So many problems. Anyone had this problem?